The resistance or impedance of grounding systems that is injected by high frequency current in not the same value that it is injected by DC currents or low frequency currents. This fenomena is caused by the grounding impedance is not only resistance but also the inductance and capacitance at high frequency. In this paper is reported the result of laboratory experiments with the simulation of grounding systems in scaling down. The measurements in this experiments use the fall of potential method. Special grounding systems for body or casing of equipments, the impedance is small and this value can be obtained by buried the grounding electrode so deeply read more..